Periberri12:
I think it is because, the air pushes the cap off. Air is very strong.
Perinberri12:
It will attract flies ants and bees, and will also likely go moldy
So the jam can stay fresh.
Jam if made at home must be put into pre boiled jam jar's and still hot. To keep the top of the jam free of fungus wet the top of the jam with a little rum.
Yes, water vapor can form outside of a hot water jar. When the hot water inside the jar heats the air around it, the air can hold more moisture. As this hot and moisture-laden air comes into contact with cooler surfaces outside the jar, such as the jar itself or the surrounding air, condensation occurs and water droplets can form.
Any jar that is air tight. Jam jars are perfect.xxx
Using hot water to open a metal jar lid helps to expand the metal, making it easier to twist open the jar. The heat from the hot water causes the metal to expand while the glass of the jar remains relatively unaffected, creating a temperature difference that helps to loosen the lid.
A jam jar.
Jam, jelly, juice, jalapeno peppers, jambalaya, jars, jerk seasonings, jerky chicken or beef, and jumping children!
when the jar has boiling water, the air above is hot and less dense therefore there is a lower amount of air molecules then out side the jar. When you put the lid on the hot air inside cools, the previously hot air condenses and creates a vacuum of lower pressure, making it harder to unscrew the lid
Hot water causes the jar lid to expand.
Check for jam jar labels in the canning section of any hardware or grocery store.
run lid over hot water and open with a cloth over lid.